CN201341095Y - Electronic servo transformer and servo system - Google Patents
Electronic servo transformer and servo system Download PDFInfo
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- CN201341095Y CN201341095Y CNU2009201297842U CN200920129784U CN201341095Y CN 201341095 Y CN201341095 Y CN 201341095Y CN U2009201297842 U CNU2009201297842 U CN U2009201297842U CN 200920129784 U CN200920129784 U CN 200920129784U CN 201341095 Y CN201341095 Y CN 201341095Y
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Abstract
An embodiment of the utility model provides an electronic servo transformer and a servo system, which is applied to the electrical distribution field, wherein, an input end of the electronic servo transformer is connected with three-phase alternating current, an output end is connected with a servo unit, the input end of the electronic servo transformer is connected with a rectification circuit, and the three-phase alternating current is input to the electronic servo transformer, and is output to the servo unit after the rectification by the rectification circuit; and a protective circuit is connected between a zero line end and an earth line end of the three-phase alternating current. The input end of the electronic servo transformer is connected with the rectification circuit, so the resistance to voltage and heavy current surge of the electronic servo transformer can be enhanced, when certain elements in the rectification circuit go wrong, a normal pathway still exists to ensure continuous operation, so as to reduce the failure rate; meanwhile, the follow-up electronic components will not be burnt out when in wrong wire connection by adopting the protective circuit for protection; and the utility model has advantages of good stability, high reliability and strong protective capability.
Description
Technical field
The utility model embodiment belongs to the distribution field, relates in particular to a kind of electronic servo transformer and servo system.
Background technology
In automation control area, servomotor is controlled conveniently, precision is high, thereby is widely adopted, and AC servomotor and servo-driver series of products that the famous electric manufacturer in various countries releases one after another separately also constantly improve and renewal.China's electrical network adopts three-phase phase voltage 380V, zero line voltage 220V, and the electronic servo transformer of 1KW above (the above great majority of 400W) adopts three-phase 200～240V (voltage fluctuation 200～240V+10%, 200～240V-15%) power supplies.
Electronic servo transformer becomes single-phase or three phase sine alternating current into adjustable stably unidirectional direct current by rectifier cell, be widely used in the accurate digital control industry, Fig. 1 shows a kind of electronic servo transformer that prior art provides, each of three-phase alternating current is connected with a rectifier bridge heap respectively mutually, form three-plase half wave rectifier circuit, two inputs of bridge rectifier in the output termination AC servo unit of this three-plase half wave rectifier circuit, the zero line of three-phase alternating current connects another input of bridge rectifier in the AC servo unit respectively.Improved the resistance to pressure and the anti-heavy current surge ability of electronic servo transformer, but there is following defective in this electronic servo transformer:
1. electric motor starting or unexpected stall can cause the impact to rectification circuit, yet this electronic servo transformer impact resistance a little less than, breakdown possibility is still arranged, and behind the short circuit, whole rectification circuit and even the servo unit that joins with it there is the possibility that burns out;
2. though the rectifier bridge heap has certain anti-heavy current surge ability and resistance to pressure, can cause this branch circuit break of circuit in case there are two diode in series to be burnt out;
3. do not having under the earth leakage protective situation,, can burn out servo system if the input wrong inserts live wire with zero line.
In sum, it is lower that the electronic servo transformer of prior art is withstand voltage, and a little less than the impact resistance, protection is not enough, burns out electronic component easily.
The utility model content
The purpose of the utility model embodiment is to provide a kind of electronic servo transformer, is intended to solve the problem that withstand voltage low, the anti-heavy current surge of existing electronic servo transformer is weak, protective capability is not enough.
The utility model embodiment realizes like this, a kind of electronic servo transformer, its input is electrically connected with three-phase alternating current, output is connected with servo unit, the input of described electronic servo transformer is connected with rectification circuit, described three-phase alternating current is imported described electronic servo transformer, exports described servo unit after described rectification circuit carries out rectification to; Be connected with protective circuit between the zero line side of described three-phase alternating current and the ground terminal.
Another purpose of the utility model embodiment is to provide a kind of servo system, described servo system comprises above-mentioned electronic servo transformer, also comprise a servo unit, the input of described electronic servo transformer is electrically connected with three-phase alternating current, the output of described electronic servo transformer is connected to the input of described servo unit, and the output of described servo unit is connected with servomotor.
The input of the electronic servo transformer that the utility model embodiment provides is connected with rectification circuit, the resistance to pressure and the anti-heavy current surge ability of electronic servo transformer have been improved, when having some element to break down in the rectification circuit, still there is one tunnel regular path to guarantee and to work on, reduced failure rate; Adopt protective circuit protection follow-up electronic component when the wrong line not burnt out simultaneously; Good stability, the reliability height, protective capability is strong.
Description of drawings
Fig. 1 is the electronic servo transformer circuit diagram that prior art provides;
Fig. 2 is the circuit diagram of the electronic servo transformer of the utility model embodiment;
Fig. 3 is the circuit diagram of the protective circuit that provides of the utility model first embodiment;
Fig. 4 is the circuit diagram of the protective circuit that provides of the utility model second embodiment;
Fig. 5 is the circuit diagram of the protective circuit that provides of the utility model the 3rd embodiment;
Fig. 6 is the various interchangeable rectifier cell schematic diagram that the utility model embodiment provides;
Fig. 7 is the electronic servo transformer circuit diagram of the employing that provides of the utility model embodiment single-phase bridge heap in parallel group;
Fig. 8 is the electronic servo transformer circuit diagram of the employing bridge jackshaft that provides of the utility model embodiment;
Fig. 9 is the electronic servo transformer circuit diagram of the bridge jackshaft of employing that provides of the utility model embodiment;
Figure 10 shows the electronic servo transformer circuit diagram of the employing single-phase bridge heap group that the utility model embodiment provides;
Figure 11 shows the electronic servo transformer circuit diagram of the employing bridge jackshaft that the utility model embodiment provides;
Figure 12 shows the electronic servo transformer circuit diagram of the employing one-way SCR that the utility model embodiment provides;
Figure 13 shows the electronic servo transformer circuit diagram of the employing three-phase commutation bridge that the utility model embodiment provides;
Figure 14 shows the servo unit first connection plan circuit diagram that the utility model embodiment provides;
Figure 15 shows the servo unit second connection plan circuit diagram that the utility model embodiment provides;
Figure 16 shows servo unit the 3rd connection plan circuit diagram that the utility model embodiment provides;
Figure 17 shows servo unit the 4th connection plan circuit diagram that the utility model embodiment provides;
Figure 18 shows the circuit diagram of a kind of servo system that the utility model embodiment provides;
Figure 19 shows the circuit diagram of the another kind of servo system that the utility model embodiment provides;
Figure 20 shows a kind of power distribution circuit figure that the utility model embodiment provides;
Figure 21 shows the connection diagram of a kind of electronic servo transformer that the utility model embodiment provides.
Embodiment
For the purpose, technical scheme and the advantage that make the utility model embodiment is clearer, below in conjunction with drawings and Examples, embodiment is further elaborated to the utility model.Should be appreciated that specific embodiment described herein only in order to explanation the utility model embodiment, and be not used in qualification the utility model embodiment.
The input of the utility model embodiment electronic servo transformer is connected with rectification circuit, the resistance to pressure and the anti-heavy current surge ability of electronic servo transformer have been improved, when having some element to break down in the bridge heap group, still there is one tunnel regular path to guarantee and can work on, reduced failure rate; Adopt protective circuit protection follow-up electronic component when the wrong line not burnt out simultaneously; Good stability, the reliability height, protective capability is strong.
The electronic servo transformer that the utility model embodiment provides can with servo unit, the supporting use of servomotor, be widely used in fields such as numerical control machining center, packaging facilities, printing equipment, Weaving device, laser process equipment, robot, testing machine, engraving machine, automatic production line.Fig. 2 shows the circuit of the electronic servo transformer that the utility model embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
The input of electronic servo transformer is electrically connected with three-phase alternating current, output is connected with servo unit, the input of electronic servo transformer is connected with rectification circuit, and three-phase alternating current input electronic servo transformer carries out exporting servo unit to after the rectification through rectification circuit; Be connected with protective circuit 200 between the zero line side of three-phase alternating current and the ground terminal.
Rectification circuit in the electronic servo transformer can adopt the mode of two single-phase bridge heaps series connection to form single-phase series bridge heap group, and for example single-phase bridge heap DB1 and single-phase bridge heap DB2 form a single-phase series bridge heap group.The three-phase voltage input R of electronic servo transformer, the external three-phase alternating current of S, T, the input three-phase alternating current, single-phase bridge heap DB1 is connected with input R with single-phase bridge heap DB2 series connection back, the end of piezo-resistance U1 is connected with input R, and the discharge tube DF1 of the other end of piezo-resistance U1 through being connected in series with it is connected to earth terminal; Single-phase bridge heap DB3 is connected with input S with single-phase bridge heap DB4 series connection back, and the end of piezo-resistance U2 is connected with input S, and the discharge tube DF2 of the piezo-resistance U2 other end through being connected in series with it is connected to earth terminal.Carry out halfwave rectifier through the single-phase bridge heap DB1 and the single-phase bridge heap DB2 of series connection respectively from R, S input input AC electricity, convert the input L1 that is transferred to the main circuit power of servo unit behind the direct current to; Be transferred to single-phase bridge heap DB5 and the single-phase bridge heap DB6 that is connected in series respectively from T input input AC electricity, and among the piezo-resistance U3, one the tunnel is transferred to earth terminal through piezo-resistance U3 and the discharge tube DF3 that is connected in series with it, halfwave rectifier is carried out through single-phase bridge heap DB5 and single-phase bridge heap DB6 in another road, converts the power input L2 that is transferred to servo unit behind the direct current to.Three-phase bridge heap DB7 in the servo unit main circuit power synthesizes the back energy storage to energy storage filter capacitor C1 with the direct current of input L1, L2 input.The direct current that single-phase bridge heap DB8 in the accessory power supply of servo unit will import from the power input L1 of servo unit synthesizes the back energy storage to energy storage filter capacitor C2, the other end of single-phase bridge heap DB8 is connected with zero line N, the main circuit power input L3 of servo unit is connected with zero line N, access zero line N after the piezo-resistance U4 branch road of connecting and the branch road parallel connection that piezo-resistance U5 and discharge tube DF5 connect simultaneously with discharge tube DF4, other end ground connection.In addition, the main circuit power input L1 of servo unit, L2, L3 are connected with three-phase bridge heap DB7 through resettable fuse (high molecular PTC) respectively, carry out overcurrent protection; If the input wrong when zero line is inserted live wire, is not burnt out by protective circuit 200 protection servo systems.
In the utility model embodiment, protective circuit can be built in the electronic servo transformer, and protective circuit also can be an independently module.
Fig. 3 shows the circuit diagram of the protective circuit that the utility model first embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
In the utility model embodiment, the coil L1 of relay module is connected between the output of ac solid relay and the live wire of three-phase alternating current (R/S/T).After the signal process rectification unit D1 rectification of input, by control light-emitting diode D2 work after voltage stabilizing didoe DW voltage stabilizing and resistance R 1 current limliting, and, promptly finished control to output by the switching circuit conducting that optical coupling is formed the bidirectional triode thyristor TR that is in the output loop; Input circuit only needs the control to luminous tube, so only need low-voltage, little electric current; Optical coupling has guaranteed the isolation between input, output; Thyristor TR size selects operating voltage and the electric current that has determined relay output for use in the output loop.After coil L1 energising, Chang Kaiduan k1 disconnects, and coil L2 quits work, and utilizes starting switch S2 to control when needs reset.When zero line and live wire wrong; the voltage of input surpasses the threshold voltage of voltage stabilizing didoe DW; trigger the optocoupler conducting; bidirectional triode thyristor TR conducting work, the coil L1 energising of relay, normal-closed end K2 disconnects; the coil L2 dead electricity of relay; major loop disconnects, and need reset again and could start, and has so just protected electronic servo transformer and the servo unit in the major loop not burnt out.
As an embodiment of the present utility model, starting switch S2 can be the shift knob of hardware, also can be software control module.
Fig. 4 shows the circuit diagram of the protective circuit that the utility model second embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
When the voltage between zero line and the ground wire surpasses the threshold value of voltage stabilizing didoe DW; diode DW conducting; through triggering optocoupler after resistance R 1 current limliting; the Q1 saturation conduction, the coil L1 work of relay, the normal-closed end K2 of relay disconnects; the coil L2 dead electricity of relay; thereby the disconnection main power source stop to the electronic servo transformer power supply, thereby protection electronic servo transformer and servo unit is not burnt out.Therefore, as long as the voltage between zero line and the ground wire is undesired, electronic servo transformer just can not normal power supply, thereby reaches the purpose of protecting electronic servo transformer.
Fig. 5 shows the circuit diagram of the protective circuit that the utility model the 3rd embodiment provides, and for convenience of explanation, only shows the part relevant with the utility model embodiment, and details are as follows.
Single-phase bridge heap (for example DB1, DB2) in the utility model embodiment can adopt other forms of rectifier cell, for example: and three-phase bridge heap, one-way SCR, diode, fast-recovery commutation diode etc., as shown in Figure 6.
In the utility model embodiment, rectifier cell comprises positive pole, negative pole, and each input of described electronic servo transformer is connected with described rectifier cell is anodal, or described electronic servo transformer input is connected with described rectifier cell negative pole.
In the utility model embodiment, bridge heap group (for example the mode of two single-phase bridge heaps series connection is formed single-phase series bridge heap group) can adopt at least two described rectifier cell series, parallel, the bridge jackshaft of at least four described rectifier cell compositions or above-mentioned combination in any.
In the utility model embodiment, the connected mode of bridge jackshaft has multiple, for example:
(1) two described rectifier cell is composed in series a branch road, at least the described branch road of two-way is in parallel again inserts described electronic servo transformer one input, and wherein the node of two of one tunnel described branch road described rectifier cells is electrically connected with the node of two described rectifier cells of the other described branch road at least one road;
(2) two described rectifier cells are composed in series arbitrary input that a branch road inserts described electronic servo transformer, and the node of two described rectifier cells of described branch road is electrically connected with the node of two described rectifier cells of the described branch road of another input that is connected described electronic servo transformer.
In the utility model embodiment, the zero line side of the three-phase alternating current fuse of connecting, blowout when the zero line interface of electronic servo transformer inserts the live wire end of three-phase alternating current, entire circuit opens circuit, and plays a protective role.As an embodiment of the present utility model, at the three phase terminals of three-phase alternating current and zero line side connect respectively a fuse, perhaps series connection one fuse before the input of electronic servo transformer connecting to neutral line.
The user can choose the parameter of piezo-resistance and discharge tube according to actual needs, and when line voltage is struck by lightning, the surge voltage of last kilovolt even volts up to ten thousand will be discharged over the ground by piezo-resistance, discharge tube.If be connected to leakage switch, then three-phase electricity is cut off in the leakage switch action; If do not connect leakage switch, but zero line N end is in series with fuse, and then with blowout, circuit is protected.In the utility model embodiment, can adopt the structure of two piezo-resistances and discharge tube series connection, the branch road of two piezo-resistances and discharge tube series connection again and be unified into one road structure that inserts zero line, the structure that the branch road of perhaps a plurality of piezo-resistances and discharge tube series connection is in parallel again is to increase compressive resistance.The user can be as required withstand voltage height, load current size, the structure of selecting connection in series-parallel to adopt.
Owing to have zero line and live wire to connect anti-situation appearance in the practical operation with electronic servo transformer, if connect instead then discharge over the ground by piezo-resistance, discharge tube, for fuse is blown rapidly, can be at the zero line place parallel connection branch road of two-way piezo-resistance and discharge tube series connection at least, then increased discharging current, fast blowout.
In the utility model embodiment, can also not adopt piezo-resistance and discharge tube, improve the withstand voltage of bridge heap, but cost is higher to 1600V (adopting import bridge heap).
In the utility model embodiment, can also be connected to the main circuit power input L1 of servo unit through bridge heap group from the R input, be connected to the main circuit power input L2 of servo unit respectively through the bridge heap from S, T input.
In the utility model embodiment, the main circuit power ways of connecting of output L1, L2, L3 and the servo unit of electronic servo transformer can have multiple, for example:
(1) the L1C end of single-phase bridge heap DB8 is connected with L1 or L2, and the L2C end is connected with L3;
(2) when the L2 end of three-phase bridge heap DB7 in the main circuit power was connected with zero line N, the L2C end of single-phase bridge heap DB8 was connected with this zero line L2, and other end L1C is connected with L1 or the L3 end of three-phase bridge heap DB7 then;
(3) the L1C end of single-phase bridge heap DB8 can be connected with any one of R, S, T, and the L2C end is connected with zero line N then;
(4) single-phase bridge heap DB8 connects an isolating transformer earlier, is connected with power supply again, has increased the antijamming capability of circuit.
In the practical application, adopt the bridge heap have easy for installation, be easy to dispel the heat, reverse withstand voltage height, rated current is big, overload capacity is strong advantage, this circuit connection is simple, stable performance.
Fig. 6 shows the various interchangeable rectifier cell that the utility model embodiment provides, in contrast to single-phase bridge heap shown in Figure 2, in the utility model embodiment, can also adopt other forms, the single-phase bridge heap that illustrates of Fig. 6 (A) for example, the three-phase bridge heap that the fast-recovery commutation diode that the one-way SCR that the diode that Fig. 6 (B) illustrates, Fig. 6 (C) illustrate, Fig. 6 (D) illustrate, Fig. 6 (E) illustrate etc.
The bridge heap group that employing the utility model embodiment provides is than adopting the high withstand voltage big current commutates element of import, and cost is much lower.
Fig. 7 shows the electronic servo transformer circuit of the employing single-phase bridge heap in parallel group that the utility model embodiment provides, and compares with Fig. 2, adopts the series connection of two single-phase bridges heaps, then with each input of bridges heap access electronic servo transformer in parallel again of two groups of series connection.
As an embodiment of the present utility model, can also adopt two single-phase bridge heaps in parallel, the bridge heap of two groups of parallel connections to be connected again insert each input of electronic servo transformer then, this structure is equivalent to bridge construction in the bridge, as shown in Figure 8.Certainly, our at least one bridge heap of can after the bridge of one group of parallel connection heap, connecting, and then each input of access electronic servo transformer of connecting with the bridge heap of other one group of parallel connection.
As an embodiment of the present utility model, can also adopt two single-phase bridge heaps in parallel, insert each input of electronic servo transformer then.
In the utility model embodiment, the series connection of two single-phase bridge heaps can also be generalized to the series connection of a plurality of single-phase bridge heap, equally also can be generalized to the connected mode of many group series arms parallel connection, and the heap of the bridge on every branch road number can be unequal.If adopt the design of each phase bridge heap group symmetry, not only have the low characteristics of output voltage, voltage symmetry, characteristics that the direct current ripple is little are more arranged, make servo unit more stable.
Fig. 8 shows the electronic servo transformer circuit of the employing bridge jackshaft that the utility model embodiment provides, compare with Fig. 7, in each input of electronic servo transformer, the centre that the single-phase bridge of two series connection is piled is connected with the middle of single-phase bridge heap of two other series connection, forms the connected mode of a bridge jackshaft.This circuit damages an element, and institute's proof voltage of entire circuit descends few, even and an element short circuit is all arranged on each series arm, open circuit, not influencing entire circuit yet, performance is more excellent.
As an embodiment of the present utility model, the circuit shown in Fig. 8 can be piled single-phase bridge the node that DB3 and single-phase bridge are piled DB4, and the node with single-phase bridge heap DB5 and single-phase bridge heap DB6 is connected again.
As an embodiment of the present utility model, the single-phase bridge of two series connection heap the node of the node single-phase bridge heap of connecting with two other by at least one bridge heap composition bridge jackshaft of series connection.Can expect that every branch road of bridge jackshaft can be by the mode of series, parallel and connection in series-parallel combination with the rectifier cell combination in any.
Fig. 9 shows the electronic servo transformer circuit of the bridge jackshaft of employing that the utility model embodiment provides, compare with Fig. 2, in two inputs of electronic servo transformer, with the node of the single-phase bridge of two series connection heap and the single-phase bridge of two other series connection pile node be connected, the connected mode of forming a bridge jackshaft, an other input of electronic servo transformer adopts the series connection of two single-phase bridge heaps to get final product, and has more stability.
Figure 10 shows the electronic servo transformer circuit of the employing single-phase bridge heap group that the utility model embodiment provides, and compares with Fig. 7, has adopted three groups of bridges heap branch roads access waies in parallel again of connecting in twos, increases withstand voltage.
Figure 11 shows the electronic servo transformer circuit of the employing bridge jackshaft that the utility model embodiment provides, compare with Figure 10 with Fig. 8, the utility model embodiment adopts three groups of bridge heaps of connecting in twos in parallel, the access way that connects in the middle of then the single-phase bridge of every group of series connection being piled has higher stability and withstand voltage degree.
As an embodiment of the present utility model, the circuit shown in Fig. 8 can be piled single-phase bridge the node that DB5 and single-phase bridge are piled DB6, and the node with single-phase bridge heap DB7 and single-phase bridge heap DB8 is connected again.
Figure 12 shows the electronic servo transformer circuit of the employing one-way SCR that the utility model embodiment provides, one-way SCR (thyristor) be series at three-phase alternating current each mutually in, and then connect with two single-phase bridges heap of parallel connection, the control end of one-way SCR is connected with resistance R 3, insert zero line after resistance R 3 is connected with voltage-stabiliser tube DW1 then, between resistance R 1 and resistance R 2 series connection back connections and T input and the N input, the junction of resistance R 1 and resistance R 2 is connected with the anode of diode D1, and the negative electrode of diode D1 is connected in the junction of resistance R 3 and voltage-stabiliser tube DW1 then.One capacitor C 3 is in parallel with voltage-stabiliser tube DW1.The anode of diode D3 is connected with L1, negative electrode is with after voltage-stabiliser tube DW4, voltage-stabiliser tube DW5, resistance R 4 are connected then, insert the control end of triode, the anode of diode D2 is connected with L2, negative electrode is with after voltage-stabiliser tube DW2, voltage-stabiliser tube DW3, resistance R 4 are connected then, insert the base stage of triode Q, the collector electrode connecting resistance R3 of triode Q and the junction of voltage-stabiliser tube DW1, emitter connecting to neutral line N.When the overtension of the branch road of L1 or L2, the trigger triode conducting, the junction ground connection that causes resistance R 3 and diode D1 can't be triggered the one-way SCR conducting, has avoided the excessive influence that circuit is produced of electric current.
Figure 13 shows the electronic servo transformer circuit of the employing three-phase commutation bridge that the utility model embodiment provides, each input of electronic servo transformer connects a three-phase commutation bridge respectively, wherein the other end of two three-phase commutation bridges interconnects again, output after connecting with a three-phase commutation bridge DB2 again after the formation parallel connection, this output is connected with the power input L1 (perhaps L2) of servo unit.After the other input of electronic servo transformer connects the three-phase commutation bridge of two series connection, be connected with another input of power supply L2 (or L1) of servo unit.
As an embodiment of the present utility model, each input of electronic servo transformer connects a three-phase commutation bridge respectively, wherein the other end of two three-phase commutation bridges interconnects again, connect with the branch road of at least two three-phase commutation bridge parallel connections again after forming parallel connection, be connected with the power input L1 (perhaps L2) of servo unit then.
Sum up above-mentioned specific embodiment,, consider actual withstand voltage degree of stability, adopt the redundant system of element connection in series-parallel combination can realize high stable and withstand voltage purpose according to the demand of virtual voltage, electric current.
The electronic servo transformer of the utility model embodiment is applicable to various servo units.Servo unit comprises main circuit power and accessory power supply, and the input of main circuit power is respectively input L1, L2, L3, and the input of accessory power supply is respectively input L1C, L2C.L1C end, the L2C end of accessory power supply have following several different connection plan, shown in Figure 14 to 17.
Figure 14 shows servo unit first connection plan that the utility model embodiment provides, and the L1C of accessory power supply end is connected with the L1 end, and the L2C end is held with L3 and is connected, L3 termination zero line N wherein, and L3 holds also can ground connection.
In the utility model embodiment, the L1C end can also be connected with the L2 end, and the L2C end is connected with the L3 end, and perhaps the L2C end is connected with zero line, and wherein the L3 end also can ground connection.
Figure 15 shows servo unit second connection plan that the utility model embodiment provides, the L2 termination zero line N of main circuit power, and the L1C end is connected with the L1 end or the L3 end of main circuit power.
Figure 16 shows servo unit the 3rd connection plan that the utility model embodiment provides, and after L1C end, L2C hold and isolating transformer is connected, is connected with any two outputs of electronic servo transformer respectively.
Figure 17 shows servo unit the 4th connection plan that the utility model embodiment provides, and the L1C end is connected L2C termination zero line N with any output of electronic servo transformer.
The utility model embodiment provides a kind of servo system, this servo system comprises above-mentioned electronic servo transformer, also comprise a servo unit, the input of electronic servo transformer is electrically connected with three-phase alternating current, its output connects the input of servo unit respectively, and the servo unit output is connected with servomotor.
Figure 18 shows the circuit of a kind of servo system that the utility model embodiment provides, and adopts circuit arrangement shown in Figure 10, and the L1C end of servo unit accessory power supply is connected L2C termination zero line N with the S input.The zero line place of this circuit connects a piezo-resistance U4 in addition, ground connection after piezo-resistance U4 connects with discharge tube DF4.
As an embodiment of the present utility model, the L1C of servo unit accessory power supply end can also be connected L2C termination zero line with R or T input.
Figure 19 shows the circuit of the another kind of servo system that the utility model embodiment provides, adopt two diodes to be composed in series a series arm, three groups of series arms each input that inserts electronic servo transformers in parallel more then, zero line input N connects a piezo-resistance U4, ground connection after piezo-resistance U4 connects with discharge tube DF4, the main circuit power input L3 of servo unit is connected with zero line, and wherein the L1C of servo unit end is connected L2C termination zero line N with the R input.
For increasing circuit stability; the logical weak point of rapid judgement and control circuit when electric voltage exception; in the utility model embodiment; between two voltage input ends and zero line, insert a testing circuit respectively; by two testing circuits two voltage input ends are detected, electric voltage exception appears and after, testing circuit can disconnect circuit rapidly; be without prejudice with protective circuit, increased the stability of entire circuit.
Figure 20 shows a kind of power distribution circuit that the utility model embodiment provides, Inturruptor for sub-line 1QF is connected with A, B, C, the N of three-phase alternating current, the other end connects noise filter FIL then, noise filter FIL1801 is connected with electronic servo transformer 1802 inputs by electromagnetic contactor 1KM again, electronic servo transformer 1802 outputs connect L1, L2, the L3 input of servo unit 1803 respectively, and servo unit 1803 connects equipment such as servomotor again.Circuit breaker K1 and circuit breaker K2 series connection in addition, again with after a manual switch 4KM is in parallel, insert in the voltage input end (for example electromagnetic contactor 1KM connects the voltage input end of three-phase alternating current A phase) of electromagnetic contactor 1KM, wherein circuit breaker K1 and K2 are respectively by a testing circuit control.
In the utility model embodiment, connect a fuse respectively at electronic servo transformer 1802 inputs, be connected with electromagnetic contactor 1KM again, as if zero line, live wire misconnection, fuse can blow disconnection, shields.As an embodiment of the present utility model, electronic servo transformer 1802 inputs can only connect a fuse at zero line N place, be connected with electromagnetic contactor 1KM again.
Figure 21 shows the connection signal of a kind of electronic servo transformer that the utility model embodiment provides, the input Input of electronic servo transformer 1901 connects R, S, T, the N end of three-phase alternating current respectively, output Output connects input L1, L2, the L3 of servo unit 1902 respectively, the input L1C end of servo unit 1902 connects L1, the L2C end connects L3, output u, the v of servo unit 1902, w are connected with motor plugs respectively, motor casing ground connection.
In the utility model embodiment, a servo system is formed in the supporting use of electronic servo transformer and servo unit.As an embodiment of the present utility model, electronic servo transformer can be used in combination with servo unit after the modularization; Have anti-thunderbolt, anti-high-voltage performance is good, protective capability is strong, cost is low, and can prevent the breakdown problem that misconnection is brought.
The electronic servo transformer input of the utility model embodiment is connected with the bridge heap group that at least two rectifier cells are composed in series, improved compressive resistance, the phenomenon of blowing easily at rectifier cell adopts the parallel connection of at least two bridge heaps to insert simultaneously, increased the electric current that can pass through, therefore, the series connection of this at least two bridges heap and/or the implementation that inserts each phase of three-phase alternating current in parallel have improved the resistance to pressure of circuit and the ability of shock resistance electric current.The bridge heap group that adopts rectifier cell connection in series-parallel cheaply to form substitutes high withstand voltage high-current device, and cost reduces, and product has more competitive advantage on market.And in circuit, adopt testing circuit that the voltage in the circuit is detected constantly, when abnormal pressure occurring or crossing low pressure, can report to the police and also can cut off circuit quickly and efficiently.Be connected with piezo-resistance at the electronic servo transformer input in addition, piezo-resistance is connected with discharge tube, and with discharge tube other end ground connection, when having high voltage to pass through high pressure is discharged, and more effectively protects electronic servo transformer.
The input of the electronic servo transformer that the utility model embodiment provides is connected with rectification circuit, the resistance to pressure and the anti-heavy current surge ability of electronic servo transformer have been improved, when having some element to break down in the rectification circuit, still there is one tunnel regular path to guarantee and to work on, reduced failure rate; Adopt protective circuit protection follow-up electronic component when the wrong line not burnt out simultaneously; Good stability, the reliability height, protective capability is strong.
The above only is the preferred embodiment of the utility model embodiment; not in order to restriction the utility model embodiment; all at the utility model embodiment spirit and principle within done any modification, be equal to and replace and improvement etc., all should be included within the protection range of the utility model embodiment.
Claims (10)
1, a kind of electronic servo transformer, its input is electrically connected with three-phase alternating current, output is connected with servo unit, it is characterized in that, the input of described electronic servo transformer is connected with rectification circuit, described three-phase alternating current is imported described electronic servo transformer, exports described servo unit after described rectification circuit carries out rectification to; Be connected with protective circuit between the zero line side of described three-phase alternating current and the ground terminal.
2, electronic servo transformer as claimed in claim 1 is characterized in that, described protective circuit is built in described electronic servo transformer.
3, electronic servo transformer as claimed in claim 1 is characterized in that, described protective circuit comprises: rectification unit, voltage stabilizing didoe and ac solid relay;
The first input end of described rectification unit is connected to the zero line of described three-phase alternating current, second input end grounding of described rectification unit, and the output of described rectification unit is connected with described ac solid relay by described voltage stabilizing didoe.
4, electronic servo transformer as claimed in claim 1, it is characterized in that, one input of described electronic servo transformer is connected with the bridge heap group that at least two rectifier cells are formed, another input is connected with at least one rectifier cell, and described at least one rectifier cell that is connected with another input is connected to the node of two rectifier cells of described bridge heap group.
5, electronic servo transformer as claimed in claim 4 is characterized in that, described rectifier cell is single-phase bridge heap, three-phase bridge heap, diode, one-way SCR or fast-recovery commutation diode.
6, electronic servo transformer as claimed in claim 4, it is characterized in that, described rectifier cell comprises positive pole, negative pole, and each input of described electronic servo transformer is connected with described rectifier cell is anodal, or described electronic servo transformer input is connected with described rectifier cell negative pole.
7, electronic servo transformer as claimed in claim 4, it is characterized in that described bridge heap group is at least two described rectifier cell series connection, at least two described rectifier cell parallel connections, the bridge jackshaft of at least four described rectifier cell compositions or above-mentioned combination in any.
8, electronic servo transformer as claimed in claim 1 is characterized in that, the zero line side of the described three-phase alternating current fuse of connecting.
9, electronic servo transformer as claimed in claim 1 is characterized in that, arbitrary input of described electronic servo transformer is connected with an end of at least one piezo-resistance, and the other end of described piezo-resistance is by discharge tube ground connection.
10, a kind of servo system, it is characterized in that, described servo system comprises the described electronic servo transformer of claim 1, also comprise a servo unit, the input of described electronic servo transformer is electrically connected with three-phase alternating current, the output of described electronic servo transformer is connected to the input of described servo unit, and the output of described servo unit is connected with servomotor.
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201297842U CN201341095Y (en) | 2009-01-22 | 2009-01-22 | Electronic servo transformer and servo system |
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| Application Number | Priority Date | Filing Date | Title |
|---|---|---|---|
| CNU2009201297842U CN201341095Y (en) | 2009-01-22 | 2009-01-22 | Electronic servo transformer and servo system |
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| Publication Number | Publication Date |
|---|---|
| CN201341095Y true CN201341095Y (en) | 2009-11-04 |
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| CNU2009201297842U Expired - Fee Related CN201341095Y (en) | 2009-01-22 | 2009-01-22 | Electronic servo transformer and servo system |
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| CN (1) | CN201341095Y (en) |
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315632A (en) * | 2011-10-14 | 2012-01-11 | 广东易事特电源股份有限公司 | Driving circuit for inhibiting over current of IGBT (Insulated Gate Bipolar Transistor) |
-
2009
- 2009-01-22 CN CNU2009201297842U patent/CN201341095Y/en not_active Expired - Fee Related
Cited By (1)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN102315632A (en) * | 2011-10-14 | 2012-01-11 | 广东易事特电源股份有限公司 | Driving circuit for inhibiting over current of IGBT (Insulated Gate Bipolar Transistor) |
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